Can you help on Weed Q

I have around 80 sq m of raised beds .... and they have suddenly developed an almost even blanket of green broad shaped leaved weeds.
They are not vine like .. these are individual plants ... covering ground like a blanket.

Never had this before - so wonder what they are and why now ?

Started pulling them all up by hand .... but curious as to what they are.

20180531_190800 by argonanut, on Flickr

I'd hoe it off and compost the results. 

Whatever it is, it's quite a prolific seeder. Have you bought in any new topsoil etc that might have caused it, or have you seen any of them in the near vicinity? They almost look like foxgloves which do seed a lot, but try rubbing a leaf with your fingers to see if there's any scent but wash your hands afterwards.